docs: create deploy/post-installation

deploy/post-installation.md

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+---
+title: Post-installation configuration
+description: 
+published: true
+date: 2022-07-30T01:01:25.043Z
+tags: 
+editor: markdown
+dateCreated: 2022-07-30T01:01:25.043Z
+---
+
+# Post-installation configuration
+
+After Phyllome OS [has been successfully installed](/deploy/install) and [its first-launch process completed](/deploy/install#first-launch), a few tasks are required before it can be used to its fullest potential.
+
+> As Phyllome OS evolves, the following post-installation configuration will, hopefully, be made obsolete 
+{.is-info}
+
+### Grant the current user the ability to manage system-based virtual machines
+
+Any new user, including the one that has been created during the first-launch set up, won't be part of the `libvirt` group. It  means that it won't be able to manage the *qemu:///system*, which runs `libvirt` as root.
+
+To avoid a password prompt each time you connect to *qemu:///system*, you can add the current user to the `libvirt` by using the following command, in the terminal:
+
+```
+sudo usermod -a -G libvirt $(whoami)
+```
+
+> Phyllome OS will eventually switch to the *qemu:///session* URI, which doesn't require elevated privileges. Have a look at [this great blog post](https://blog.wikichoon.com/2016/01/qemusystem-vs-qemusession.html) to understand some of the differences between the *session* and the *system* URI.  
+{.is-info}
+
+### Update GRUB and reboot
+
+Unfortunately, the GRUB config won't correctly update during the kickstart phase, so it has to be done manually.
+
+```
+sudo grub2-mkconfig -o /boot/grub2/grub.cfg
+```
+When the is done, please reboot: `sudo reboot`
+
+### Modify the system allocated to the GPU in the BIOS/UEFI (vfio-mdev only)
+
+> Some computers allow you to modify the system memory allocated or shared with the integrated GPU, which may allow you to create more vGPUs.
+{.is-info}
+
+> For Intel integrated graphics cards only; rarely available on laptops computers.
+{.is-warning}
+
+* Before the host operating system boots up, you need to enter the BIOS/UEFI and to look for a setting called *GPU aperture size*, or *GPU shared memory*. 
+
+* Use the highest possible value.
+
+> System memory will be reserved for the GPU, so make sure you have enough system memory to accomodate both the GPU and your operating system. 
+{.is-warning}
+
+
+---
+
+*Are you looking for tasks to do with your system? If so, have a look at doing some [suggested tasks](/gofurther)*
+
+[^1]: Although, we very much encourage you to [hack it](https://github.com/PhyllomeOS/phyllomeos#how-to-hack-phyllome-os).